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- La johnsenita-(Ce) és un mineral de la classe dels silicats, que pertany al grup de l'eudialita. Rep el seu nom del Dr. Ole Johnsen (1940-), antic conservador del Museu de Geologia de la Universitat de Copenhaguen (Dinamarca), per la seva extensa investigació sobre el grup de l'eudialita i per les seves contribucions a la mineralogia en general, tant científica com popular. En particular, la seva recerca es va centrar en la mineralogia de Groenlàndia. (ca)
- Johnsenita-(Ce) silikato motako minerala da eta eudialyte taldearen kidea da. (eu)
- Johnsenite-(Ce) is a very rare mineral of the eudialyte group, with the chemical formula Na12(Ce,La,Sr,Ca,[ ])3Ca6Mn3Zr3WSi(Si9O27)2(Si3O9)2(CO3)O(OH,Cl)2. The original formula was extended to show the presence of both the cyclic silicate groups and silicon at the M4 site, according to the nomenclature of the eudialyte group. It is the third eudialyte-group mineral with essential tungsten (after khomyakovite and manganokhomyakovite), and second with essential rare earth elements (after zirsilite-(Ce), which is the niobium-analogue of johnsenite-(Ce)). In fact, some niobium substitutes for tungsten in johnsenite-(Ce). Other characteristic feature is the presence of essential carbonate group, shared with carbokentbrooksite, golyshevite, mogovidite and zirsilite-(Ce). (en)
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- 4873 (xsd:nonNegativeInteger)
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- H-M symbol: (en)
- Hexagonal scalenohedral (en)
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| dbp:cleavage
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- Pale yellow to bright orange (en)
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- Transparent or Translucent (en)
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| dbp:fracture
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| dbp:habit
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- skeletal crystals ; aggregates (en)
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| dbp:luster
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- 9 (xsd:integer)
- (8/E.25-57 ) (en)
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- a = 14.24, c = 30.03 [Å] ; Z = 3 (en)
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| rdfs:comment
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- La johnsenita-(Ce) és un mineral de la classe dels silicats, que pertany al grup de l'eudialita. Rep el seu nom del Dr. Ole Johnsen (1940-), antic conservador del Museu de Geologia de la Universitat de Copenhaguen (Dinamarca), per la seva extensa investigació sobre el grup de l'eudialita i per les seves contribucions a la mineralogia en general, tant científica com popular. En particular, la seva recerca es va centrar en la mineralogia de Groenlàndia. (ca)
- Johnsenita-(Ce) silikato motako minerala da eta eudialyte taldearen kidea da. (eu)
- Johnsenite-(Ce) is a very rare mineral of the eudialyte group, with the chemical formula Na12(Ce,La,Sr,Ca,[ ])3Ca6Mn3Zr3WSi(Si9O27)2(Si3O9)2(CO3)O(OH,Cl)2. The original formula was extended to show the presence of both the cyclic silicate groups and silicon at the M4 site, according to the nomenclature of the eudialyte group. It is the third eudialyte-group mineral with essential tungsten (after khomyakovite and manganokhomyakovite), and second with essential rare earth elements (after zirsilite-(Ce), which is the niobium-analogue of johnsenite-(Ce)). In fact, some niobium substitutes for tungsten in johnsenite-(Ce). Other characteristic feature is the presence of essential carbonate group, shared with carbokentbrooksite, golyshevite, mogovidite and zirsilite-(Ce). (en)
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- Johnsenita-(Ce) (ca)
- Johnsenita-(Ce) (eu)
- Johnsenite-(Ce) (en)
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